STP631

    Fracture Characteristics of Plain and Welded 3-In.-Thick Aluminum Alloy Plate at Various Temperatures

    Published: Jan 1977


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    Abstract

    The tensile, notch tensile, tear, and, in some cases, fracture-toughness properties (KQ and KIc, ksi √in.) have been evaluated for 3-in.-thick 5083-H321, 5086-H32, 6061-T651, and 7005-T6351 plain plate and gas metal arc (GMA) welds in 5083-H321 (5183 filler), 6061-T651 (4043 and 5356 fillers), and 7005-T6351 (5356 filler) with no subsequent thermal treatment. The tests were made in the longitudinal, long-transverse and short-transverse orientations for the plain plate and in the “cross-weld” orientation for the welded panels. The tests were made at room temperature and generally at −100 and −320°F.

    The fracture indexes, that is, notch-yield ratio and unit-propagation energy values, rank the plate and welds. The KQ and KIc values have been developed for the 6061-T651 and 7005-T6351 plate.

    For the relatively tough materials in this investigation, the notch-yield ratio versus KIc relationship was not useful in estimating KIc values. However, the unit-propagation energy values versus KIc relationship does appear to provide a satisfactory means of estimating KIc values. Estimates of KIc values for all the materials tested in this program have been made from this correlation.

    Keywords:

    crack propagation, fracture properties, tensile properties, aluminum alloys, weldments


    Author Information:

    Nelson, FG
    Senior engineers, Engineering Properties and Design Division, Alcoa Laboratories, Alcoa Center, Pa.

    Brownhill, DJ
    Senior engineers, Engineering Properties and Design Division, Alcoa Laboratories, Alcoa Center, Pa.


    Paper ID: STP35546S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP35546S


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